Agavoideae is a subfamily of

monocot Monocotyledons (), commonly referred to as monocots, (Lilianae ''sensu'' Chase & Reveal) are grass and grass-like flowering plants (angiosperms), the seeds of which typically contain only one embryonic leaf, or cotyledon. They constitute one of ...

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

s in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Asparagaceae Asparagaceae, known as the asparagus family, is a family of flowering plants, placed in the order Asparagales of the monocots. The family name is based on the edible garden asparagus, ''Asparagus officinalis''. Those who live in the temperate c ...

, order

Asparagales Asparagales (asparagoid lilies) is an order (biology), order of plants in modern classification systems such as the Angiosperm Phylogeny Group (APG) and the Angiosperm Phylogeny Web. The order takes its name from the type (biology), type family ...

. It has previously been treated as a separate family, Agavaceae. The group includes many well-known

desert A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About on ...

and dry-zone types, such as the agaves and yuccas (including the

Joshua tree ''Yucca brevifolia'' is a plant species belonging to the genus ''Yucca''. It is tree-like in habit, which is reflected in its common names: Joshua tree, yucca palm, tree yucca, and palm tree yucca. This monocotyledonous tree is native to the ar ...

). About 640

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

are placed in around 23

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

; they are widespread in the tropical, subtropical, and warm temperate regions of the world.

Description and uses

Species may be

succulent In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word ''succulent'' comes from the Latin word ''sucus'', meani ...

or not. In general, Agavoideae leaves occur as rosettes at the end of a woody stem, which may range from extremely short to tree-like heights, as in the

. The leaves are parallel-veined, and usually appear long and pointed, often with a hardened spine on the end, and sometimes with additional spines along the margins. ''Agave'' species are used to make ''

tequila Tequila (; ) is a liquor, distilled beverage made from the Agave tequilana, blue agave plant, primarily in the area surrounding the city of Tequila, Jalisco, Tequila northwest of Guadalajara, Jalisco, Guadalajara, and in the Jaliscan Highlands ...

pulque Pulque (; nci, metoctli), or octli, is an alcoholic beverage made from the fermented sap of the maguey (agave) plant. It is traditional in central Mexico, where it has been produced for millennia. It has the color of milk, a rather viscous c ...

,'' and ''

mezcal Mezcal (, ), sometimes spelled mescal, is a distilled alcoholic beverage made from any type of agave. The word ''mezcal'' comes from Nahuatl , which means "oven-cooked agave", from and .What is MezcalElmezcal.org Traditionally the word " ...

'', while others are valued for their fibers. They are quite popular for

xeriscaping Xeriscaping is the process of landscaping, or gardening, that reduces or eliminates the need for irrigation. It is promoted in regions that do not have accessible, plentiful, or reliable supplies of fresh water and has gained acceptance in other ...

, as many have showy flowers.

Systematics

The taxonomy of the group has varied widely. In the APG III system of 2009, adopted here, the Agavoideae are defined very broadly to include the former family Agavaceae along with other formerly separate families such as Anemarrhenaceae, Chlorogalaceae, Hostaceae, Yuccaceae, Anthericaceae, Hesperocallidaceae, and Chlorogalaceae, based on data from

molecular systematics Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

. Stevens comments that "The broad concept of Agavoideae ..may not seem very satisfactory" but that none of the alternatives is better. Sources prior to 2009 will still have Agavaceae (in varying circumscriptions) as a separate family and may contain varying numbers of other families included in the Agavoideae in the APG III system. Some genera formerly placed in this group (under whatever name) have been separated off; e.g. '' Dracaena'', which superficially resembles some species of ''

Agave ''Agave'' (; ; ) is a genus of monocots native to the hot and arid regions of the Americas and the Caribbean, although some ''Agave'' species are also native to tropical areas of North America, such as Mexico. The genus is primarily known for ...

'', is currently placed in the subfamily

Nolinoideae Nolinoideae is a monocot subfamily of the family Asparagaceae in the APG III system of 2009. It used to be treated as a separate family, Ruscaceae s.l. The family name is derived from the generic name of the type genus, ''Nolina''. The subfam ...

Genera

A partial list of the genera included in the Agavoideae is given below. The reference is to the source that places the genus in this subfamily. As noted above, the genera currently included here have varied widely in their limits and assignment to families and subfamilies; some former family placements other than Agavaceae are found in the literature are given below.

References

* * *

External links

Agavaceae
in Flora of North America.

in L. Watson and M.J. Dallwitz (1992 onwards). The families of flowering plants: descriptions, illustrations, identification, information retrieval.
Die Agaven

i
BoDD – Botanical Dermatology Database
* * {{Taxonbar, from=Q162802 Asparagales subfamilies

Description and uses

Systematics

Genera

See also

References

External links